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March 21, 2011


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Great presentations Chad. It was nice to get more detailed info on VNX.

Mark Burgess

Hi Chad,

Following on from our discussion at VMware PEX I have been trying to get my head around how to configure FAST VP pools. Your presentation above states that we can mix EFDs, SAS and NL-SAS in a single pool, but they must be the same RAID type.

I also understand that EMC's best practice for capacity drives (1TB/2TB NL-SAS/SATA) is to use RAID 6 due to the long rebuild times should a drive fail.

As we want to create FAST VP pools that consist of EFD, SAS and NL-SAS drives this leaves us with a bit of a problem.

We can either:

1. Use RAID 5 - thereby breaking EMC's best practice on using RAID 6 for NL-SAS drives
2. Use RAID 6 - which will have a write performance impact on Flash and SAS drives and decrease the usable capacity

What is EMC's recommended RAID type for heterogeneous pools with large capacity drives?

I have searched PowerLink extensively but I cannot find a statement from EMC on this.

Also the VNX Reference architecture for VMware View uses FAST VP with NL-SAS drives in a RAID 5 configuration going against EMC's best practice!!!

You can see why I am getting confused!!!

Many thanks

dewey hylton

i enjoyed the event and both of your talks. thanks for the great information!

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